1. Department of General Surgical Science, Gunma University Graduate School of Medicine, Maebashi, Gunma 371‑8511, Japan
2. Department of Diagnostic Pathology, Gunma University Graduate School of Medicine, Maebashi, Gunma 371‑8511, Japan
3. School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK
4. Department of Oral and Maxillofacial Surgery, and Plastic Surgery, Gunma University Graduate School of Medicine, Maebashi, Gunma 371‑8511, Japan
5. Department of Breast Surgery, International University of Health and Welfare, Chiba 286‑8520, Japan